Drive and bearing for a shaft-less open-end spinning rotor

Details Drive and bearing for a shaft-less open-end spinning rotor Drive and bearing for a shaft-less open-end spinning rotor

1994-09-30

1996-11-05

Hail, III, Joseph J.

Textiles: spinning, twisting, and twining

Apparatus and processes

Open end spinning

57100, D01H 414

Patent

active

055705723

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a device for an open end spinning machine with a drive and bearing for a shaftless spinning rotor in accordance with the preferred embodiment of the present invention. Such a device with a drive and bearing for a shaftless open end spinning rotor is known from patent application WO 92/01096. Its combined magnetic-gas bearing with plane-parallel bearing faces is distinguished by extremely low friction losses and by a rotation around the axis through the center of gravity which is free of radial forces of the spinning rotor seated thereon in the supercritical rpm range. Such a device is particularly suited for driving very rapidly rotating spinning rotors. The construction of the device is still too expensive. It is also disadvantageous that, because of the many components, numerous joining tolerances can add up and in this way the exact position of the spinning rotor axis in relation to the axis of the take-off nozzle in the spinning machine can be impaired. The tolerance requirements, the costs of manufacturing and installation make the known device expensive. It is not possible in this device to prevent damage to the spinning rotor in case of possible extreme deflections of the spinning rotor.


SUMMARY OF THE INVENTION

It is the object of the invention to remove these disadvantages, to improve the operational dependability and the efficiency. It is also intended to reduce the axial space requirements. The device is intended to be suitable for driving spinning rotors of different sizes.
Briefy summarized, the stator core with its winding is fixedly seated in a one-piece stator housing made, for example, of injection-molded plastic material. The housing for the gas bearing, the gas distribution device, areas for cooling the stator and the bearing as well as holders for the spring and damping elements of the stator suspension are also formed in this stator housing. This one-piece stator housing has the advantage that seating tolerances which occur when several parts are joined together are avoided. It is achieved in this way that the magnetic guide axis coincides with the axis through the center of gravity, because inaccuracies on account of joining tolerances and magnetic tolerances during assembly do not occur.
The yoke plate of the magnetic bearing and connections for the supply lines are integrated into the stator housing. On its open side, the chamber for the pressure gas in the stator housing is sealed by means of a gas bearing cover. The combination of several parts and functions in a common stator housing lowers the manufacturing costs of the device, because several work steps of positionally exact joining and gluing and of curing in-between are omitted. The improvements by means of the novel one-piece stator housing with the parts of the device formed thereon also result in a more dependable device. The guide ring surrounding the inserted spinning rotor in an annular gap limits its possible deflection, so that the spinning rotor cannot leave the field of the holding and centering magnets in the stator housing and instead is guided back into the bearing center.
In accordance with the preferred embodiment of the present invention, a yoke plate injection-molded into the stator housing has a threaded stem for the gas bearing cover, and the gas bearing cover has a gas connector with a threaded bore.
In accordance with the preferred embodiment of the present invention the dimensional stability of the bearing is improved by means of reinforcing ribs in the gas chamber of the stator housing.
In the embodiment in accordance with the preferred embodiment of the present invention, the housing of the device consists of an upper housing part and a lower housing part, and the spring and damping elements for the stator are formed in one piece with the lower housing part.
In accordance with the preferred embodiment of the present invention, the holders of the stator housing are placed on bar springs seated in holders at the free end of plate springs of the low

REFERENCES:
patent: 4022008 (1977-05-01), Pimiskern et al.
patent: 4306166 (1981-12-01), Quandt
patent: 4543780 (1985-10-01), Muller et al.
Patent Abstracts of Japan --vol. 10, No. 207(M-500)(2263) 19 Jul. 1986 & JP A 61 048 613(Ryuichi Matsuda) 10 Mar. 1986.

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